Pinpoint Test G: The Washer Pump Is Inoperative/Does Not Operate Correctly
Wipers and Washers
Pinpoint Test G: The Washer Pump is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information Electrical Diagrams.
Normal Operation
When the wiper/washer switch is placed in the WASH position, the SCCM (Steering Column Control Module) sends the request to the windshield wiper motor through the LIN (Local Interconnect Network). The windshield wiper motor controls the direction of the washer pump to direct washer fluid to the windshield or rear window.
When a windshield wash is requested, the windshield wiper motor supplies voltage to the washer pump. Ground is provided to the washer pump through the normally closed contact in the rear washer relay (located in the Battery Junction Box (BJB)).
When a rear window wash is requested, the windshield wiper motor activates the rear washer relay. When the rear washer relay is activated, it provides voltage to the washer pump. Ground is provided to the washer pump through the windshield wiper motor.
This pinpoint test is intended to diagnose the following:
- Fuse
- Rear washer relay
- Wiring, terminals or connectors
- Wiper/washer switch
- Windshield wiper motor
PINPOINT TEST G : THE WASHER PUMP IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
G1 CHECK THE WIPER/WASHER SWITCH (F_WASH_SW) AND (R_WASH_SW) PIDs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- SCCM (Steering Column Control Module).
- While monitoring the SCCM (Steering Column Control Module) F_WASH_SW PID, place the wiper/washer switch into the windshield wiper WASH position.
- While monitoring the SCCM (Steering Column Control Module) R_WASH_SW PID, place the wiper/washer switch into the rear window wiper WASH position(s).
Do each of the PIDs change to the ON state when the wiper/washer switch is in the applicable WASH positions?
Yes
GO to G2.
No
INSTALL a new wiper/washer switch. REFER to Wiper/Washer Switch . TEST the system for normal operation.
If the concern is still present, INSTALL a new SCCM (Steering Column Control Module). TEST the system for normal operation.
G2 CHECK THE WINDSHIELD WASH FUNCTION
- Ignition ON.
- Attempt to operate the windshield wash function.
Does the washer pump operate in the windshield WASH position?
Yes
GO to G8.
No
GO to G3.
G3 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
- Ignition OFF.
- Disconnect: Washer Pump Motor C137.
- Connect the 12-volt incandescent test light between the the positive battery post and the washer pump motor C137-1, circuit CRW23 (VT/GN), harness side.
Does the test light illuminate?
Yes
GO to G6.
No
GO to G4.
G4 CHECK THE REAR WASHER RELAY GROUND CIRCUIT FOR AN OPEN
- Disconnect: Rear Washer Relay.
- Measure the resistance between the rear washer relay socket pin 4, circuit GD120 (BK/GN) and ground.
Is the resistance less than 5 ohms?
Yes
GO to G5.
No
REPAIR the circuit. TEST the system for normal operation.
G5 CHECK THE REAR WASHER RELAY
- Carry out the rear washer relay component test.
Did the rear washer relay pass the component test?
Yes
REPAIR circuit CRW23 (VT/GN) for an open. TEST the system for normal operation.
No
INSTALL a new rear washer relay. TEST the system for normal operation.
G6 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
- Ignition ON.
- Connect the 12-volt incandescent test light between the washer pump motor C137-1, circuit CRW23 (VT/GN), harness side and the washer pump motor C137-2, circuit CRW14 (BU/WH), harness side.
- Observe the test light while placing the wiper/washer switch into the windshield WASH position.
Does the test light illuminate when WASH is selected?
Yes
INSTALL a new washer pump. REFER to Washer Pump . TEST the system for normal operation.
No
GO to G7.
G7 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR A SHORT TO GROUND OR OPEN
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between the washer pump C137-2, circuit CRW14 (BU/WH), harness side and the windshield wiper motor C125-7, circuit CRW14 (BU/WH), harness side; and between the washer pump C137-2, circuit CRW14 (BU/WH), harness side and ground.
Is the resistance less than 5 ohms between the washer pump and windshield wiper motor; and greater than 10,000 ohms between the washer pump and ground?
Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
G8 CHECK THE WASHER PUMP CONTROL CIRCUIT FOR AN OPEN
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
- Ignition OFF.
- Disconnect: Washer Pump Motor C137.
- Ignition ON.
- Connect the 12-volt incandescent test light between the positive battery post and the washer pump motor C137-2, circuit CRW14 (BU/WH), harness side.
Does the test light illuminate?
Yes
GO to G9.
No
INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield . TEST the system for normal operation.
G9 CHECK FOR VOLTAGE TO THE REAR WASHER RELAY
- Ignition OFF.
- Disconnect: Rear Washer Relay.
- Ignition ON.
- Measure the voltage between the rear washer relay socket pin 2, circuit CDC64 (YE/OG) and ground; and between the rear washer relay socket pin 5, circuit SBB82 (YE/RD) and ground.
Is the voltage greater than 10 volts for both measurements?
Yes
GO to G10.
No
VERIFY Battery Junction Box (BJB) fuse 82 (15A) is OK. If OK, REPAIR the circuit in question. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams. TEST the system for normal operation.
G10 CHECK THE REAR WASHER RELAY
- Ignition OFF.
- Carry out the rear washer relay component test.
Did the rear washer relay pass the component test?
Yes
GO to G11.
No
INSTALL a new rear washer relay. TEST the system for normal operation.
G11 CHECK THE REAR WASHER RELAY CONTROL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between the rear washer relay socket pin 1, circuit CRW34 (BU/BN) and the windshield wiper motor C125-12, circuit CRW34 (BU/BN), harness side.
Is the resistance less than 5 ohms?
Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor - Windshield . TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.